Prove2Me

A short sum of doubled integers

Proved
WorkbookSyntax.plus_41583

by wamlart · Sep 12, 2026 · Mathlib 0df444a (Lean v4.33.1)

lean-workbookrepaired-notationsource-checked

∑x=132x=12\sum_{x=1}^{3}2x=12.

Notation repair: Replaced the obsolete finite-sum binder “in” with the current “∈” notation. The ranges, summands, hypotheses and conclusion are unchanged.

Source: Lean-Workbook record lean_workbook_plus_41583 (Apache-2.0). Original declaration.

Preamble
import Mathlib
open Nat
Formal statement
theorem WorkbookSyntax.plus_41583 : ∑ x ∈ Finset.Icc 1 3, 2 * x = 12   :=  by sorry
Source
https://huggingface.co/datasets/internlm/Lean-Workbook/blob/main/lean_workbook.json, record lean_workbook_plus_41583; finite-sum notation repair; Apache-2.0

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